Control of railway and like vehicles



Jan. 13, 1931. J. NEALE ET AL 1,789,251

CONTROL OF RAILWAY AND LIKE VEHICLES I Filed Nov. 9, 1929 v 2 Sheets-Sheet l B P Fig. 2. D- D f p d ,2

Fig. 3.

ATTORNEY Jan. 13, 1931. J. NEALE ETAL I 1,789,251

CONTROL OF RAIEIWAY AND LIKE VEHICLES Filed Nov. 9, 1929 I 2 Sheets-Sheet 2 Fig. 5;

I I I I I I I I l I I I I I I I I I I I I I VI I I I" I I I I w vnvrom @ZMLM 197 7' OR VE V Patented Jan." 13, 1931 UNITED STATES JOHN NEALE, or LoNnoN, AND HORACE ROBERT- WA'rsofNQor wI-MBLEnoN, ENGLAND CONTROL or RAILWAY hNnL IxEvnilIIoLEs Application filed November 9, 1929, Serial No. 406,022, and in. Great Britain' 'Nove bi 9 1923;

oil the local light from the light sensitive cell is neutralized when desired by an ad .ditional source or sources of light and thus 7 the light sensitive cell remains illuminated when desired in [spite of the presence of the interrupter blade. It follows, therefore, that control, signal or other mechanism in connection with the light sensitive cell will not be affected when the additional lights are active.

This neutralization of the efi'ect of the interrupter blade may beobtained in various. ways, by direct or reflected illumina-'- tion of the light sensitive cell. Thus we have the choice of two alternative operative effects on the passing of the interrupter, according to whether the additional lights are lighted or not, and thus control is ef-' fected without mechanical movement of the blade. The preferred use of the illuminated condition of the cell being to withhold train brakes-it will be seen that accidental failure of the interrupter lampswould re 'sult in the application of the brakes and never in a false security. r s

The invention will now be described by way of example only with reference to the accompanying drawings, in which i Fig. 1 showsan illuminated cell unit aboutto be obscured by an interrupter blade with neutralizing lamps, which it is approaching. r

Figs. 2 and 3 show alternative arrangements of neutralizing lamps. 1

Fig. 4: shows a further alternative arrangement.

t will of I Fig.5 represents an elevation correspond-- .ing-to Fig.4.

Referring now to Fig.;1,---A represents the lamp u'sed -for normal illumination of the light-sensitive cell 'B, A and 'Bboth-being suitably I shielded" from -exterior illumina tion, such; as daylight. interrupter bladeii D represents series of neutralizing lamps. v I

As applied-in one form to arailway-sig nall ing ancbco'ntrollin'g system, A and- 'B- form an illuminated light sensitive unitwhich has movement relative to the stationary' blade 7 C' and lamps D. Thus the action will be thatif the interrupter blade: C-passes between A and B and the lamps D are not illuminated, the light will be" cut off from B and any mechanism in connection :with it will be operated,- such as'brakes and/or 'sign'als. If, however, the lamps Dare illuminated when C passes between A v and B, light passing fromfA -to" B- will" be cut off, but will be replaced by the-light from the lam s D; Therefor any mechanisnrfadaptri ed toibe operated-by the :larke'ning of the lightsensitive cellwill not functio' In Fig. 2 the lamps Dare shown placed" on either side of the bladeC, thus allowing the: mechanism 'to' continue to function i-f the direction of travel of the vehicle, upon C represents the Sit whi'chthe illuminated. light sensitive unit is I whereintheflanipsiDare mounted centrally '7 below the blade. Light given off from the lamps D and operating -tl1e*cellJB-may be either'reflected-or direct. F

1 Figs.-

and show "a further:

construe tional: form; characterized *bythe ifactth at i the lamps D are optically arranged --to-' cast" a beam. towards :the oncoming vehi clexand approximately parallel to its. direct travel. Y For thispurpose the cellfB has apertures Y both towards the lampfAv-andfthe lamps 1. A control an interrupter blade, and an additional source oflllumination associated with said I thmbiea forth comprlslng a light-sensitive cell, a source f of light constantly illuminating. said cell, f

ire

2}} v i 1,789,261 ."i L T.

interrupter blade, the arrangement being such that on relative movement between the said light-sensitive cell with its source of illumination and the interrupter with its 5 associated source of illumination the said :cell is illuminated by the additional source of light on the passage of the interrupter blade between said light-sensitive cell and its source of illumination, when said additional source of illumination is functioning.

* 2. A control according to claim 1 wherein: the additional source of illumination com- H prises a plurality of lamps located to one side of said interrupterblade.

3. A control according to claim 1 wherein said source of illumination comprises an electric lamp located to one side of said interrupter blade.

.4. A .controlof he character specified comprising :a light-sensitivecell 1 and a1 source of illumination mounted in spaced relation on aimoving object, a stationary interrupter blade, said blade being so positioned that on the passage of the moving objectsaid blade interrupts the passage of light-"from said source of illumination to said light-sensitivescell, and an additional source'of illumination being so disposed relatively to-said interrupter-blade thatduring the passage-fio'f said object said additional source of illumination,- when functioning; illuminating the light-sensitive cell. 5; A control: for the purpose specified comprisinga light-sensitive cell, a source of illumination normally illuminating said cell, a stationary interrupter blade, said blade being's o located that on the passage of said cell with its 'sourceiof; illumination said blade obstructs the illumination of said 40 cell and additional sources of illumination associated *with said blade and located'in the direction ofinovement. ofsaid'cell. v

,6. A" control for the purpose specified comprising a seleniumrcell, an electric lamp 745 normally illuminating said a cell, said cell and-lamp being arranged in spaced relation on an object to be "controlled, a stationary interrupter blade, said blade being so arranged that onthe passage of s'aidobject it passes between said cell, and sa-id'lar'np, and,

- additional lamps.

,7 HORACE nonnnrwii'rsofi a plurality 'ofadditional electric lamps 'ar a ranged in a row parallel-to said blade, said a v 'cellqhaving apertures-directedboth towards the first mentioned lampqand towards the v 'In testimony-whereof, we have signedournames to this specification at London, Eng land, 17th day -ofOctober, 1929.:

V JOHN NEALE; 

